asp.net中在前台用js增删ListBox的items

asp.net中在前台用js增删ListBox的items(1)

现在的项目中,有个搜索部分,需要对搜索结果Grid显示字段让用户选择

于是 用2个ListBox分别列示所有可显示字段和已选择显示字段

并在前台用js控制2个Listbox之间项目的增删和移动
(没办法,测试mm说后台事件有刷新的看着不舒服...)

于是 搞2个html button
事件如下:(先别管Hidden1)

function Test( lbFieldsSelect,value)
            {
                for (j = 0;j<lbFieldsSelect.length; j++)
                {                   
                    if (lbFieldsSelect.options[j].value == value) return true;           
                }
                return false;
            }
           
            function SelectField()
            {
                var lbFields = document.getElementById("lbFields");               
                var lbFieldsSelect = document.getElementById("lbFieldsSelect");
                var Hidden1 = document.getElementById("Hidden1");